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Old 01-16-2020, 09:56 AM   #169
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just got mine installed sounds awesome! no rattle or drone and no rust stainless steel don't rust
Certain types of Stainless will in fact show surface rust. Flowmaster uses that type of stainless(409). It's not pure stainless...a magnet will stick to the mufflers and pipe but not the tips.
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Old 01-16-2020, 11:21 AM   #170
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it will took mine a while befor it started to rattle.
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real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1
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Old 01-16-2020, 11:44 AM   #171
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Did you guys cut the tabs in your npp actuators per the rattle tsb?
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Old 01-16-2020, 11:48 AM   #172
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? cut what
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real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1
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Old 01-16-2020, 11:54 AM   #173
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If you haven’t done this you might be good to go.

This cleaned up all my rattle, it’s nuts

https://www.camaro6.com/forums/showthread.php?t=556061
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Old 01-16-2020, 03:35 PM   #174
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Oh damn, I am going to try that. Thanks for the heads up!!
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Old 01-17-2020, 01:31 PM   #175
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Originally Posted by KingLT1 View Post
Certain types of Stainless will in fact show surface rust. Flowmaster uses that type of stainless(409). It's not pure stainless...a magnet will stick to the mufflers and pipe but not the tips.
Tips are 304, rest of Exhaust is 409S


Most modern factory exhaust systems are made from 409 stainless steel. It is strong and will last 8-10 years in a moderate climate. 409 stainless steel will rust on the surface. However, this is not a concern for most people because it is hidden under the vehicle. Surface rust can be cleaned with a wire brush.

304 stainless is the highest quality material used for exhaust parts. It will last 10 years or more in a moderate climate. However, it is the most expensive. It will not rust for many years. But, it will turn a golden brown color after being exposed to heat.
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Old 01-17-2020, 08:26 PM   #176
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Yep I agree.
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Old 01-23-2020, 02:03 AM   #177
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Quote:
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Tips are 304, rest of Exhaust is 409S


Most modern factory exhaust systems are made from 409 stainless steel. It is strong and will last 8-10 years in a moderate climate. 409 stainless steel will rust on the surface. However, this is not a concern for most people because it is hidden under the vehicle. Surface rust can be cleaned with a wire brush.

304 stainless is the highest quality material used for exhaust parts. It will last 10 years or more in a moderate climate. However, it is the most expensive. It will not rust for many years. But, it will turn a golden brown color after being exposed to heat.

This post is why I come to the forums.
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Old 01-29-2020, 08:22 PM   #178
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Oh damn, I am going to try that. Thanks for the heads up!!
U guys have any luck?
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Old 01-29-2020, 11:33 PM   #179
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No not yet...probably won't mess with it till spring when I get the car out of hibernation.
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Old 02-05-2020, 03:21 PM   #180
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U guys have any luck?
I welded my secondary cats back in made it about 20% quieter and got rid of most of the drone. I also pulled the npp fuse and rattle is gone forever. It also sounds better because you dont hear it open and close from when your revving in neutral. I think the flowmaster npp sounds fine without any other mods and is not too loud to make any neighbors angry.
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